Few squat questions, confused

[Dedicated]

Figured I'd post this here, since the squat is one of the big lifts.

Are these what people call ATF squats?
http://www.exrx.net/WeightExercises/GluteusMaximus/BBFullSquat.html

Also what is the difference between olympic squats and regular squats? I looked at animations on exrx for regular squats and here (http://www.bsu.edu/webapps/strengthlab/home.htm)
and they look the same.

And lastly, which squats should I be doing, I usually go a little below parallel but not as low as the full squat, what category would that fall under, would those be olympic squats?

[unshift]

olympic is ATF (ass-to-floor) in which you just physically can't go any deeper. a regular squat is slightly past parallel.

you're doing full squats. ATF has its place but usually full squats get the job done

[Max-Mex]

Depends on you knees. If your knees can handle ATF squats then go for it. If knees are a problems, then parallel or slightly below will do just fine.

[Dedicated]

Cool thanks guys, gonna go squat now!

[drew]

Been doing squats ATF for a while and my knees actually feel better now than they ever did.